Undo has unpredictable results. #120251

New Issue

HotKnife · 2024-04-04T12:51:38+02:00

HotKnife commented

2024-04-04 12:51:38 +02:00

System Information
Operating system: Windows-10-10.0.22631-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 4090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 528.24

Blender Version
Broken: version: 4.1.0, branch: blender-v4.1-release, commit date: 2024-03-25 20:42, hash: 40a5e739e270
Worked: (newest version of Blender that worked as expected)

Short description of error
Undo system ignores any Hair actions. Doesn't undo the adding of hairs or any of the actions taken within the the Hair system - such as adding hairs etc, and pressing undo once hair actions are complete, undoes any action taken before 'entering' the hair grooming system. For example Unwrapping an object then adding hair and doing some grooming - Ctrl Z will undo the unwrap. This is not the expected behaviour.

Exact steps for others to reproduce the error

unwrap the cube to a new Unwrap state.
Add empty hair
Add a few Hairs with Add Hair.
Switch to Object mode.
Press Ctrl Z

The undo system ignores any of the hair actions and undo's the unwrap.

**System Information** Operating system: Windows-10-10.0.22631-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 4090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 528.24 **Blender Version** Broken: version: 4.1.0, branch: blender-v4.1-release, commit date: 2024-03-25 20:42, hash: `40a5e739e270` Worked: (newest version of Blender that worked as expected) **Short description of error** Undo system ignores any Hair actions. Doesn't undo the adding of hairs or any of the actions taken within the the Hair system - such as adding hairs etc, and pressing undo once hair actions are complete, undoes any action taken before 'entering' the hair grooming system. For example Unwrapping an object then adding hair and doing some grooming - Ctrl Z will undo the unwrap. This is not the expected behaviour. <video src="https://projects.blender.org/attachments/c4bbc3ba-bce0-4265-8e78-0bf67a2a1cdc" controls></video> **Exact steps for others to reproduce the error** 1. unwrap the cube to a new Unwrap state. 2. Add empty hair 3. Add a few Hairs with Add Hair. 4. Switch to Object mode. 5. Press Ctrl Z The undo system ignores any of the hair actions and undo's the unwrap.

HotKnife added the

labels 2024-04-04 12:51:38 +02:00

Iliya Katushenock commented

2024-04-04 17:21:48 +02:00

I can't reproduce this issue.

HotKnife commented

2024-04-04 18:18:23 +02:00

Hi - thanks for getting back so quickly. Video attached. @37s I press Ctrl Z and the unwrapping is undone - notice that the fur stays.
Which I don't expect as a behaviour.
Upon looking further - if I toggle Global Undo in pref' to On - it behaves correctly - so maybe this the issue.

Hi - thanks for getting back so quickly. Video attached. @37s I press Ctrl Z and the unwrapping is undone - notice that the fur stays. Which I don't expect as a behaviour. Upon looking further - if I toggle Global Undo in pref' to On - it behaves correctly - so maybe this the issue.

(Unsaved) - Blender 4.1 2024-04-04 17-14-03.mp4

11 MiB

Calibrator commented

2024-04-04 20:50:12 +02:00

Ok I was about to do a quick rant cause it just happened and I couldn't reproduce it at will, but it turns out I can. With global undo on.

I am editing a curve with that setup, if I am in edit mode and change the radius then press undo, that change is ignored. Instead it undoes the last curve shape change I did. If I go in object mode and I change the radius then the radius is reverted with undo.

I also noticed this with the Shader Editor but I can't remember which mode caused it.

Ok I was about to do a quick rant cause it just happened and I couldn't reproduce it at will, but it turns out I can. With global undo on. ![Screenshot_20240404_204732.jpg](/attachments/33f58583-4751-400f-a064-068167cd78d7) I am editing a curve with that setup, if I am in edit mode and change the radius then press undo, that change is ignored. Instead it undoes the last curve shape change I did. If I go in object mode and I change the radius then the radius is reverted with undo. I also noticed this with the Shader Editor but I can't remember which mode caused it.

Screenshot_20240404_204732.jpg

177 KiB

Germano Cavalcante commented

2024-04-04 21:04:59 +02:00

For me, this problem would be more expected to happen with global undo OFF.

Just to check if that is the case, @HotKnife, can you try with Factory Settings?

Go to File → Defaults → Load Factory Settings and then see if you still can reproduce this issue.

For me, this problem would be more expected to happen with global undo OFF. Just to check if that is the case, @HotKnife, can you try with Factory Settings? Go to File → Defaults → Load Factory Settings and then see if you still can reproduce this issue.

Germano Cavalcante added

Status

Needs Information from User

and removed

Status

Needs Triage

labels 2024-04-04 21:05:09 +02:00

Calibrator commented

2024-04-04 22:01:13 +02:00

For me, this problem would be more expected to happen with global undo OFF.

Just to check if that is the case, @HotKnife, can you try with Factory Settings?

Go to File → Defaults → Load Factory Settings and then see if you still can reproduce this issue.

My particular example with the curve and geometry nodes also happens with factory settings and global undo. I'm curious to see what HotKnife says for his example.

I added a blend file in case you want to test it. Just move the curve points a few times, edit the radius a few times then ctrl + z

> For me, this problem would be more expected to happen with global undo OFF. > > Just to check if that is the case, @HotKnife, can you try with Factory Settings? > > Go to File → Defaults → Load Factory Settings and then see if you still can reproduce this issue. My particular example with the curve and geometry nodes also happens with factory settings and global undo. I'm curious to see what HotKnife says for his example. I added a blend file in case you want to test it. Just move the curve points a few times, edit the radius a few times then ctrl + z

Curve test.blend

879 KiB

HotKnife commented

2024-04-04 22:27:17 +02:00

Hi - with Factory Settings - It doesn't reproduce.
If I then turn Global Undo OFF. Restart B' - the problem reproduces.

Switching to Weight Painting also provides odd results.

Cube.
Switch to Weight Paint.
Ctrl Z
Result : Mode changes to Edit Mesh mode & all Weight painting is gone. (this is with Global Undo OFF)

Hi - with Factory Settings - It doesn't reproduce. If I then turn Global Undo OFF. Restart B' - the problem reproduces. Switching to Weight Painting also provides odd results. 1. Cube. 2. Switch to Weight Paint. 3. Ctrl Z Result : Mode changes to Edit Mesh mode & all Weight painting is gone. (this is with Global Undo OFF)

Pratik Borhade commented

2024-05-10 11:14:19 +02:00

Hi, looks like curve sculpt mode actions are written in memfile. With global undo turned off, this behavior is expected (no undo steps are generated)
Not a bug, closing.

Hi, looks like curve sculpt mode actions are written in memfile. With global undo turned off, this behavior is expected (no undo steps are generated) Not a bug, closing.

Pratik Borhade closed this issue

2024-05-10 11:14:22 +02:00

Blender Bot added

Status

Archived

and removed

Status

Needs Information from User

labels 2024-05-10 11:14:24 +02:00

Sign in to join this conversation.